I have lowered the gearing on my Airnimal Chameleon and have no further use for the above. It’s a little worn – less than 900 miles done. It’s an HG CS6500; 12-13-14-15-17-19-21-24-27t. Chain Reaction Cycles currently charge £34 for a new one; I suggest a £10 donation to the Cyclists’ Defence Fund.